linux-kernel - Re: [PATCH v3 1/2] dt-bindings: soc: ti: pruss: Add clocks for ICSSG

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Message-ID: <96ea0c11-e6e7-4801-9c06-2dc80b21b1ab@ti.com>
Date: Wed, 20 Nov 2024 18:53:37 +0530
From: "Anwar, Md Danish" <a0501179@...com>
To: Roger Quadros <rogerq@...nel.org>, Vignesh Raghavendra <vigneshr@...com>,
        MD Danish Anwar <danishanwar@...com>, <conor+dt@...nel.org>,
        <krzk+dt@...nel.org>, <robh@...nel.org>, <ssantosh@...nel.org>,
        <nm@...com>
CC: <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <s-anna@...com>, <kristo@...nel.org>,
        <srk@...com>
Subject: Re: [PATCH v3 1/2] dt-bindings: soc: ti: pruss: Add clocks for ICSSG

Hi Roger,

On 11/19/2024 4:15 PM, Roger Quadros wrote:
> 
> 
> On 19/11/2024 08:12, Vignesh Raghavendra wrote:
>>
>>
>> On 18/11/24 19:22, Roger Quadros wrote:
>>>
>>>
>>> On 18/11/2024 15:33, Roger Quadros wrote:
>>>> Hi,
>>>>
>>>> On 13/11/2024 13:09, MD Danish Anwar wrote:
>>>>> The ICSSG module has 7 clocks for each instance.
>>>>>
>>>>> These clocks are ICSSG0_CORE_CLK, ICSSG0_IEP_CLK, ICSSG0_ICLK,
>>>>> ICSSG0_UART_CLK, RGMII_MHZ_250_CLK, RGMII_MHZ_50_CLK and RGMII_MHZ_5_CLK
>>>>> These clocks are described in AM64x TRM Section 6.4.3 Table 6-398.
>>>>>
>>>>> Add these clocks to the dt binding of ICSSG.
>>>>>
>>>>> Link: https://www.ti.com/lit/pdf/spruim2 (AM64x TRM)
>>>>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>>>>> ---
>>>>>  Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml | 10 ++++++++++
>>>>>  1 file changed, 10 insertions(+)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml b/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
>>>>> index 3cb1471cc6b6..927b3200e29e 100644
>>>>> --- a/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
>>>>> +++ b/Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
>>>>> @@ -92,6 +92,16 @@ properties:
>>>>>      description: |
>>>>>        This property is as per sci-pm-domain.txt.
>>>>>  
>>>>> +  clocks:
>>>>> +    items:
>>>>> +      - description: ICSSG_CORE Clock
>>>>> +      - description: ICSSG_IEP Clock
>>>>> +      - description: ICSSG_RGMII_MHZ_250 Clock
>>>>> +      - description: ICSSG_RGMII_MHZ_50 Clock
>>>>> +      - description: ICSSG_RGMII_MHZ_5 Clock
>>>>> +      - description: ICSSG_UART Clock
>>>>> +      - description: ICSSG_ICLK Clock
>>>>> +
>>>>
>>>> There are actually many more clocks [1]
>>>> What is the purpose of adding all these clocks in the DT if driver doesn't
>>>> use them?
>>>>
>>
>> DT should completely describe the HW and not based on what Linux driver
>> needs. So its valid to describe all clock inputs to a module
>> irrespective of what driver does with it.
> 
> Fair point. But there are a total 11 clocks instead of 7 in [1]
> 

I took the list of clocks from AM64x TRM [1] Section 6.4.3 Table 6-398.
In the TRM only 7 clocks are mentioned per ICSSG instance which I have
mentioned in the binding.

[1] https://www.ti.com/lit/ug/spruim2h/spruim2h.pdf?ts=1732108738816

>>
>>>> Only CORE and IEP clocks parent can be configured via clock muxes.
>>>> Those are already defined in the icssg?_cfg nodes.
>>>
>>> Actually those clock muxes are internal to ICSSG.
>>> We still need to be able to set clock parents of CORE and IEP clock.
>>>
>>> So pruss block needs at most 2 clocks like you had in v2 of this patch?
>>>
>>>>
>>>> [1] - https://software-dl.ti.com/tisci/esd/22_01_02/5_soc_doc/am64x/clocks.html
>>>>
>>>>>  patternProperties:
>>>>>  
>>>>>    memories@[a-f0-9]+$:
>>>>
>>>
>>
> 

-- 
Thanks and Regards,
Md Danish Anwar